I have the F90bt, a GMOS-04 and a pac sw-ps...... I have all the wiring here on my desk and I am soldering all the connections. Using the GMOS it looks like it will pull most everything out of the exiting harness. I know I have to find the wire in the steering column for the pac unit and the reverse wire...

will I need to find the VSS wire? there is one out of the GMOS

This is for an 04 Escalade with Nav already.,, I just can't get used to not digging for more wires... I did the hardware override that was a breeze. Thanks Eddy

yep its that easy! it translates all the info, including the vss from the data wire in the gm radio harness. simple install! and yes, connect the vss!

This is interesting on the VSS. I too am wiring up my GMOS-04 before my install this weekend. Does this also work on vehicles which did not come with factory nav? I wasn't planning on connecting the VSS wire as I figured it would be useless, but I might have to do that. Thanks.

This is interesting on the VSS. I too am wiring up my GMOS-04 before my install this weekend. Does this also work on vehicles which did not come with factory nav? I wasn't planning on connecting the VSS wire as I figured it would be useless, but I might have to do that. Thanks.

On my avic N2 it made a huge difference!

Installed yesterday Pac Swi-ps and GMOS-04 are a huge help. both units work perfectly. I have not finished as I have not hooked up my subs or backup camera. Ran out of daylight and I have a long drive today. Only issue was no sound out of XM ran in here did a search and realized I had the cable in the wrong slot on the unit.......